Extrusion apparatus



Mm@ E@ Wm.. 51". 3. vANDEmGm-"T LYWV EXTRUS I ON APPARATUS Filedneo. 27, 1927 2 sheets-sheet 1 Patented June 10, 1930 UNITED STATES PATENT OFFICE vFRANK C. VANDERGRIFT, 0F AKRON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

NATIONAL-ERIE COMPANY, OF ERIE, PENNSYLVANIA, A. CORPORATION OF PENN- SYLVANIA EXTRUSION APPARATUS Application filed December 27, 1927. Serial No. 242,646.

My invention relates to extrusion apparatus, and particularly to apparatus of this type peculiarly adapted for straining either crude or reclaimed rubber, and the principal object of my invention is to provide new and improved apparatus of this type particularly adapted for this use. AIn the drawings accompanying this specification and forming a part of this application I have shown, for purposes of illustration, one form which my invention may assume, and in these drawings:

Figure 1 is a side elevation of the embodiment of my invention herein shown,

Figure 2 is a section taken on the line 2-2 of Figure 1,

Figure 3 is a section taken on the line 3--3 of Flgure 2,

Figure 4 is an enlarged View of a fragment of Figure 3 showing particularly the outlet openings, while,

Figure 5 is an enlarged view showing particularly the baiile construction at the forward end of the screw cooling-water chamber.

The embodiment of my invention herein shown comprises operating mechanism '11 serving to operate the extrusion mechanism 12 and of any construction suitable for rotating the extrusion mechanism screw 13, such operating mechanisms being well known in the art, wherefore any detailed description thereof may be omitted since such operating mechanism in itself forms no part of my invention.

The extrusion mechanism 12 shown herein comprises a casing 14 provided with a bore 15 in which is mounted a sleeve 16, a pedestal 17 suitably supporting the casing 14, and a strainer shell 18 mounted on the end of the casing 14 held in position by means of an annular plate 19 which is secured to the end of the casing 14 by suitable machine screws 2O and is provided with a central. screw threaded bore 21 screw threadedly receiving the externally screw `threaded end 22 of the shell 18. Closing the outer end of the shell 18 is an end cap 23 provided on its outer end with bar sockets 46,' provided centrally with a bearing 24 for supporting the outer end of the screw 13, and provided surrounding the bearing 24 with an annular cooling-water chamber 25 which is herein shown as fed by a supply duct 26 and as discharging through a waste duct 27.

The casing 14 is similarly cooled by cooling water entering from an inlet duct 29 through an inlet distributor 28 into annular passages 30 which surround the bore 15 of the casing 14 and from which the cooling water discharges through a waste duct 31, and the screw 13 is itself cooled by cooling water flowing from an inlet duct 32 through a bore 33 in the bearing 24 into a bore 34 in the extension 47 of the screw 13 which leads to a cooling-water chamber 35 in the forward portion of the screw 13 from which the water is discharged through a duct 36 passing through the rear portion of the screw 13.

The sleeve 16 and the shell 18 obviously form a screw chamber comprising a section 37 of reduced diameter within the sleeve 16 and a section 38 of greater diameter within the shell 18, the material is fed into this screw chamber through a hopper 39 formed on the casing 14 at the rear end of the extrusion mechanism 12 and communicating with the rear end of the screw chamber section 37 by means of an opening 40 formed in the sleeve 16, and the material is forced out of the screw chamber 37--38 through a multiplicity of openings 41 provided in the lateral wall of the shell 18, the material being fed forward from the screw casing section 37 into the screw casing 38 by the rear portion of the screw 18 lying within the sleeve 16 and then forced outwardly through the apertures 41 by the forward portion of the screw 13 lying within the shell 18.

Of course it will be obvious that no material larger than one of the apertures 41 can pass through the apertures 41 from the screw chamber section 38,' and accordingly that the passage of the rubber through the mechanism above described will remove from the rubber all foreign material of a size larger than the size of one of the apertures 41. Theoretically,then, this apparatus may be used to remove particles of any desired smallness merely by correspondingly decreasing the size of the apertures 41, but in practice it is found that there is a practical limit to the decrease in size of the apertures 41 below which it is more advantageous to reduce the passages in the manner which I have shown herein particularly in Figure 4 wherein I have shown the apertures 41 of the shell 18 as faced by a fine wire screen 42 having a mesh of the desired smallness and herein shown both as faced by a wire screen 43 of somewhat larger mesh and effective to relieve the line wire screen 42 from some of the strain and also as backed by a heavy wire screen 44 serving to support both the fine wire screen 42 and the intermediate wire screen 43, all of the wire screens 42 and 43 and 44 being formed as cylinders fitting snugly within each other and within the apertured shell 18.

It will be apparent to those skilled in the art that the Aapert-ures 41, or the mesh of the wire screens 42 and 43 and' 44, may be made of whatever size may be desired. For the purpose of straining crude or reclaimed rubber, however, I iind it convenient to form the apertures 41 of quarter inch diameter, to use forty mesh screen for the fine screen 42, to

use twenty mesh screen for the relieving screen 43, and to use eight mesh screen for the supporting screen 44. Also in practice I find it desirable to apply the maximum cooling to the forward end of the screw 13, and accordingly I mount Wit-hin the cooling-water chamber 35 of the screw 13 at the forward end thereof a baffle 45 supported with its edges spaced from the walls of the cooling'- water chamber 35 and effective to deflect the inflowing cooling water against the walls of the cooling-water chamber 35 right at the front end of the screw 13, this baffle 45 being shown more in detail in Figure 5, wherein it is shown as supported from the end of the screw-extension 47 by a plurality of machine screws 48, and heldspaced from this end of the screw-extension 47 by collars 49 surrounding the machine screws 48 between the bale 45 and the end of the screwextension 47.

'F rom the above description it will be obvious to those skilled in the art that the embodiment of my invention herein disclosed provides new and improved extrusion apparatus particularly suitable for straining crude and reclaimed rubber. time those skilled in the art also will appreciate that the embodiment of my invention herein shown and described may be used for other purposes than those herein specilicaly 4pointed out or suggested, and embodies a vantages other than those specifically pointed out or suggested herein, and also that this articular embodiment of my invention here- 1n disclosed may be variousl changed and modified without departing rom the spirit of my invention or sacrificing the advantages thereof, wherefore it will be understood. that At the same the disclosure herein is illustrative only, and that -my invention is not limited thereto.

1. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing supported adjacent its rear portion and eX- tending forwardly in outboard relation with respect to the support, said casing being provided at its rear portion with an inlet opening for the introduction of material into said chamber and at its forward portion with an outlet for the egress of such material froml said chamber; a screw, mounted within said chamber rotatable to force such material out through said outlet; and a forward bearing for said screw supported in thel forward outboard portion of said casing.

2. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing, provided at its rear portion with an inlet opening for the introduction of material into said chamber'and at its forward portion with an outlet for the egress of such material vfrom said chamber; a screw, mounted within said chamber rotatable to force such material out through said outlet, and cored out to form a cooling-water chamber interiorly of said screw; connections, for introducing cooling water at the front end of said screw; and a baffle, mounted at the front end of said cooling-water chamber, for deflecting such water against the forward portion of the walls of said cooling-water chamber. l

3. Extrusion mechanism, as for straining rubber, comprising: a screw-'chamber casing supported adjacent its rear portion and eX- tending forwardly in outboard relation with respect to the support, said casing being provided at its rear portion with an inlet opening for the introduction into said chamber of material to be strained, and provided in the lateral wall of its forward portion with a multiplicity of small outlet openings for the lateral egress from said chamber of such materialv strained of those foreign bodies which will not pass through said outlet openings; a screw, mounted within said chamber rotatable to force such material out through said outlet openings; and a forward bearing for said screw supported in the forward outboard portion of said casing.

4. Extrusion mechanism, as for straining rubber, comprising: a screw-chamber casing, provided at its rear portion with an inlet opening for the introduction into said chamber of material to be strained, and provided in the lateral wall of its forward portion with a multiplicity of small outlet openings for the egress from said chamber of such material strained of those foreign bodies which will not pass through said outlet openings; a screw, mounted within said chamber rotatable to force such material out through said outlet openings, and cored out to form a cooling-water chamber interiorly of said screw;

connections, for introducing cooling water at the front end of said screw; and a baffle, mounted at the front end of said coolingwater chamber, for delecting such water against the forward portion of the walls of said cooling water chamber.

5. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing supported adjacent its rear portion and extending forwardly in outboard relation with respect to the support, said casing being provided at its rear portion with an inlet opening for the introduction of material into said chamber and at its forward portion with an outlet for the egress of such material from said chamber; a screw, mounted within said chamber rotatable to force such material out through said outlet, and cored out to form a cooling-water chamber interiorly of said screw; a forward bearing for said screw supported in the forward outboard portion of said casing; and connections, at said forward bearing, for introducing cooling water at the front end of said screw.

6. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing, provided at its rear portion with an inlet opening for the introduction of material into said chamber and at its forward portion with an outlet for the egress of such material from said chamber; a screw, mounted within said chamber rotatable to force such material out through said outlet, and cored out to form a cooling-water chamber interiorly of said screw; a forward bearing forv said screw mounted in the forward portion of said casing; connections, at said forward bearing, for introducing cooling water at the front end of said screw; and a bathe, mounted at the front end of said cooling-water chamber, for deflecting such water against the forward portion of the wall of said cooling-water chamber.

7. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing supported adjacent its rear portionl and extending forwardly in outboard relation with respect to the sup`port,-said casing being provided at its rear portion with an inlet opening for the introduction of material into said chamber and at its forward portion with an inlet for the egress of such material from said chamber; a screw, supported within said chamber rotatable to force such material out through said outlet, and cored out to form a cooling-water chamber interiorly of said screw; a forward bearing for said screw supported in the forward outboard portion of said casing; connections, at said forward bearing, for introducing cooling water at the front end of said screw; and a baffle, mounted at the front end of said cooling-water chamber, for defiecting such water against the forward portion of the wall of said cool ing-water chamber.

8. Extrusion mechanism, as for extruding rubber, comprising: a screw-chamber casing supported adjacent its rear portion and extending forwardly in outboard relation with respect to the support, said casing being provided at its rear portion with an inlet opening for the introduction into said chamber of material to be strained, and provided in the lateral wall of its forward portion with a multiplicity of small outlet openings for the egress from said chamber of such material strained of those foreign bodies which will not pass through said outlet openings; a screw, mounted within said chamber rotatable to force such material out through said outlet, and cored out to form a coolingwater chamber interiorly of said screw a forward bearing for said screw supported in the forward outboard portion of said casing; and connections, at said forward bearing, for inn troducing cooling water at the front end of said screw.

9. Extrusion mechanism, as for eXtruding rubber, comprising: a screw-chamber casing supported adjacent its rear portion and extending forwardly in outboard relation with respect to the support, said carrier being provided at its rear portion with an inlet open ing for the introduction into said chamber of material to be strained, and provided in the lateral wall of its forward portion with a multiplicity of small inlet openings for the egress from said chamber of such material strained of those foreign bodies which will not pass through said inlet openings; a screw, supported within said chamber rotatable to force such material out through said outlet, and cored out to form a cooling-water chamber interiorly of said screw; a forward bearing for said screw supported in the forward outboard portion of said casing; connections, at said forward bearing, for introducing cooling water at the front end of said Screw; and a baffle, mounted at the front end of said coolingavater chamber, for deflccting such water against the inward portion of the wall of said cooling-water chamber.

10 Extrusion mechanism, as for straining rubber, comprising: an elongated screwchamber casing closed at its forward end portion, provided at its rear portion with an inlet opening for the introduction into said chamber of material to be strained, and provided rearwardly of the closed end portion with a longitudinally extending area of small laterally disposed outlet perforations for the lateral egress from said chamber of such material strained of those foreign bodies which will not pass through said outlet perforations; a screw, mounted within said chambe'r and extending from the closed end rearwardly through the perforated portion ofA said chamber, said screw being rotatable to force such material out through said outlet perforations, and cored out to form a cooling-water chamber interiorly of said screw and extending continuously through the-per forated portion of said casing; and connections,for introducing cooling water at the front end of said screw and forwardly of the perforated portion of said casing.

11. Extrusion mechanism, as for straining rubber, comprising; an elongated Screw.- chamber casing closed at its forward end portion, provided at its rear portion with an inlet openin for the introduction into said chamber o material to be strained, and provided along its length rearwardly of the closed `end portion with a longitudinally extending area of small laterally disposed outlet perforations for the lateral egress from said chamber of such material strained of those foreign bodies which will not -pass through said outlet perforations; a screw, mounted within said chamber and extending from the closed end rearwardly through the perforated portion of said chamber, said screw being rotatable to force such material out through said outlet perforations, and cored out to form a cooling-water chamber interiorly of said screw and extending continuously through the perforated portion of said casing; a forward bearing for said screw mounted in the closed end portion of said casing, forwardly of said outlet perforations; and connections, at said yforward bearing, for introducing cooling water into said v screw at the front end of said screw,

In testimony whereof I hereunto aflix my signature.v FRANK C. VANDERGRIFT. 

